Tablets will out ship almost all other PC form factors combined next year, forming nearly 50 per cent of the total market, according to Canalys.
The worldwide client PC market grew 18 per cent in the third quarter of this year, despite desktop and notebook shipments continuing to decline.
Read more stories about the IT Channel
However, tablet shipment accounted for 40 per cent of PC shipments, less than half a million units behind global notebook shipments.
Canalys predicts this trend to continue and has forecasted 285 million units to ship in 2014, growing to 396 million units in 2017.
Apple and Samsung are expected to keep ahead of their competitors in the medium term.
But their could be challenges for both vendors as the market heats up.
Apple has maintained its top vendor position throughout 2013, while Canalys predicts the launch of the iPad Air and new iPad mini to strengthen that position in in the final quarter of this year.
Its desktop and notebook business has remained stable while other vendors have seen their shipments deteriorate.
Apple's prioritization of protecting gross margins will see its PC market share continue to decline.
Canalys analyst Tim Coulling said Apple's decline in PC market share was unavoidable when considering its business model.
"Samsung narrowly took the lead in EMEA this quarter and Apple will lose its position to competitors in more markets in the future," he said.
"However, Apple is one of the few companies making money from the tablet boom. Premium products attract high value consumers; for Apple, remaining highly profitable and driving revenue from its entire ecosystem is of greater importance than market share statistics."
Canalys forecasts that Microsoft will take 5 per cent of the tablet PC market in 2014, up from just 2 per cent in 2012.
Canlys analyst Pin Chen Tang said 2014 would bring another major shift for the company as the Nokia acquisition brings it a step closer to being a fully-fledged smart mobile device vendor.
"As a vendor Microsoft needs to prove to channel partners and consumers that it is in this market for the long haul," he said.
"Balancing the competition with its vendor partners and embracing a 'challenger' rather than an incumbent mentality is essential.
"To improve its position it must drive app development and better utilize other relevant parts of its business to round out its mobile device ecosystem."
Android-derived operating systems will be responsible for driving growth in the market and are forecast to take 65 per cent share in 2014 with 185 million units.
Samsung continues to lead with strong year-on-year growth coming from its broad tablet portfolio, and in the third quarter of 2013 it had a 27 per cent share of Android tablet shipments.
But with hundreds of small-to-micro brand vendors in established and high-growth markets and international players such as Acer, Asus, Lenovo, and HP, this market share statistic will also start to decline.